diff --git a/package.json b/package.json
index 9d98416..2d6f1c9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ccstatusline",
-  "version": "2.1.4",
+  "version": "2.1.5",
   "description": "A customizable status line formatter for Claude Code CLI",
   "module": "src/ccstatusline.ts",
   "type": "module",
diff --git a/src/types/StatusJSON.ts b/src/types/StatusJSON.ts
index fd5012a..6589a5a 100644
--- a/src/types/StatusJSON.ts
+++ b/src/types/StatusJSON.ts
@@ -1,5 +1,19 @@
 import { z } from 'zod';
 
+const CoercedNumberSchema = z.preprocess((value) => {
+    if (typeof value !== 'string') {
+        return value;
+    }
+
+    const trimmed = value.trim();
+    if (trimmed.length === 0) {
+        return value;
+    }
+
+    const parsed = Number(trimmed);
+    return Number.isFinite(parsed) ? parsed : value;
+}, z.number());
+
 export const StatusJSONSchema = z.looseObject({
     hook_event_name: z.string().optional(),
     session_id: z.string().optional(),
@@ -19,27 +33,27 @@ export const StatusJSONSchema = z.looseObject({
     version: z.string().optional(),
     output_style: z.object({ name: z.string().optional() }).optional(),
     cost: z.object({
-        total_cost_usd: z.number().optional(),
-        total_duration_ms: z.number().optional(),
-        total_api_duration_ms: z.number().optional(),
-        total_lines_added: z.number().optional(),
-        total_lines_removed: z.number().optional()
+        total_cost_usd: CoercedNumberSchema.optional(),
+        total_duration_ms: CoercedNumberSchema.optional(),
+        total_api_duration_ms: CoercedNumberSchema.optional(),
+        total_lines_added: CoercedNumberSchema.optional(),
+        total_lines_removed: CoercedNumberSchema.optional()
     }).optional(),
     context_window: z.object({
-        context_window_size: z.number().nullable().optional(),
-        total_input_tokens: z.number().nullable().optional(),
-        total_output_tokens: z.number().nullable().optional(),
+        context_window_size: CoercedNumberSchema.nullable().optional(),
+        total_input_tokens: CoercedNumberSchema.nullable().optional(),
+        total_output_tokens: CoercedNumberSchema.nullable().optional(),
         current_usage: z.union([
-            z.number(),
+            CoercedNumberSchema,
             z.object({
-                input_tokens: z.number().optional(),
-                output_tokens: z.number().optional(),
-                cache_creation_input_tokens: z.number().optional(),
-                cache_read_input_tokens: z.number().optional()
+                input_tokens: CoercedNumberSchema.optional(),
+                output_tokens: CoercedNumberSchema.optional(),
+                cache_creation_input_tokens: CoercedNumberSchema.optional(),
+                cache_read_input_tokens: CoercedNumberSchema.optional()
             })
         ]).nullable().optional(),
-        used_percentage: z.number().nullable().optional(),
-        remaining_percentage: z.number().nullable().optional()
+        used_percentage: CoercedNumberSchema.nullable().optional(),
+        remaining_percentage: CoercedNumberSchema.nullable().optional()
     }).nullable().optional()
 });
 
diff --git a/src/types/__tests__/StatusJSON.test.ts b/src/types/__tests__/StatusJSON.test.ts
new file mode 100644
index 0000000..801830c
--- /dev/null
+++ b/src/types/__tests__/StatusJSON.test.ts
@@ -0,0 +1,61 @@
+import {
+    describe,
+    expect,
+    it
+} from 'vitest';
+
+import { StatusJSONSchema } from '../StatusJSON';
+
+describe('StatusJSONSchema numeric coercion', () => {
+    it('coerces numeric strings to numbers', () => {
+        const result = StatusJSONSchema.safeParse({
+            cost: {
+                total_cost_usd: '1.25',
+                total_duration_ms: '12345',
+                total_api_duration_ms: '2345',
+                total_lines_added: '12',
+                total_lines_removed: '3'
+            },
+            context_window: {
+                context_window_size: '200000',
+                total_input_tokens: '1200',
+                total_output_tokens: '340',
+                current_usage: {
+                    input_tokens: '100',
+                    output_tokens: '50',
+                    cache_creation_input_tokens: '20',
+                    cache_read_input_tokens: '10'
+                },
+                used_percentage: '9.3',
+                remaining_percentage: '90.7'
+            }
+        });
+
+        expect(result.success).toBe(true);
+        if (!result.success) {
+            return;
+        }
+
+        expect(result.data.cost?.total_duration_ms).toBe(12345);
+        expect(result.data.context_window?.context_window_size).toBe(200000);
+        expect(result.data.context_window?.current_usage).toEqual({
+            input_tokens: 100,
+            output_tokens: 50,
+            cache_creation_input_tokens: 20,
+            cache_read_input_tokens: 10
+        });
+        expect(result.data.context_window?.used_percentage).toBe(9.3);
+    });
+
+    it('keeps invalid numeric strings rejected', () => {
+        const result = StatusJSONSchema.safeParse({ context_window: { context_window_size: 'not-a-number' } });
+
+        expect(result.success).toBe(false);
+    });
+
+    it('keeps empty numeric strings rejected', () => {
+        const result = StatusJSONSchema.safeParse({ context_window: { context_window_size: '' } });
+
+        expect(result.success).toBe(false);
+    });
+});
\ No newline at end of file